"Failed to acquire semaphore" with ACPI since 2.6.10-rc2

I've been sticking with 2.6.9 for a while. Since 2.6.10-rc2, when ACPI is
enabled, I spontaneously (I don't know how to provoke them) get lots of these
messages:

osl-0940 [1279] os_wait_semaphore     : Failed to acquire
semaphore[00000100018befa0|1|0], AE_TIME
osl-0940 [1292] os_wait_semaphore     : Failed to acquire
semaphore[00000100018befa0|1|0], AE_TIME
...

Same problem in 2.6.14-rc1. With acpi=off, there's no problem. In
2.6.10-r1, with or without ACPI, no problem.

I have an nForce 3 mainboard in an Asus laptop, arch is x86_64, and all
kernels are vanilla and without proprietary nvidia in the tests.

Please CC my personal address.

Thanks,
Havard
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